include/linux/netfilter.h - third_party/kernel - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __LINUX_NETFILTER_H
 #define __LINUX_NETFILTER_H

 #include <linux/init.h>
 #include <linux/skbuff.h>
 #include <linux/net.h>
 #include <linux/if.h>
 #include <linux/in.h>
 #include <linux/in6.h>
 #include <linux/wait.h>
 #include <linux/list.h>
 #include <linux/static_key.h>
 #include <linux/netfilter_defs.h>
 #include <linux/netdevice.h>
 #include <linux/sockptr.h>
 #include <net/net_namespace.h>

 static inline int NF_DROP_GETERR(int verdict)
 {
 	return -(verdict >> NF_VERDICT_QBITS);
 }

 static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
 				   const union nf_inet_addr *a2)
 {
 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 	const unsigned long *ul1 = (const unsigned long *)a1;
 	const unsigned long *ul2 = (const unsigned long *)a2;

 	return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
 #else
 	return a1->all[0] == a2->all[0] &&
 	       a1->all[1] == a2->all[1] &&
 	       a1->all[2] == a2->all[2] &&
 	       a1->all[3] == a2->all[3];
 #endif
 }

 static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
 				     union nf_inet_addr *result,
 				     const union nf_inet_addr *mask)
 {
 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 	const unsigned long *ua = (const unsigned long *)a1;
 	unsigned long *ur = (unsigned long *)result;
 	const unsigned long *um = (const unsigned long *)mask;

 	ur[0] = ua[0] & um[0];
 	ur[1] = ua[1] & um[1];
 #else
 	result->all[0] = a1->all[0] & mask->all[0];
 	result->all[1] = a1->all[1] & mask->all[1];
 	result->all[2] = a1->all[2] & mask->all[2];
 	result->all[3] = a1->all[3] & mask->all[3];
 #endif
 }

 int netfilter_init(void);

 struct sk_buff;

 struct nf_hook_ops;

 struct sock;

 struct nf_hook_state {
 	u8 hook;
 	u8 pf;
 	struct net_device *in;
 	struct net_device *out;
 	struct sock *sk;
 	struct net *net;
 	int (*okfn)(struct net *, struct sock *, struct sk_buff *);
 };

 typedef unsigned int nf_hookfn(void *priv,
 			       struct sk_buff *skb,
 			       const struct nf_hook_state *state);
 enum nf_hook_ops_type {
 	NF_HOOK_OP_UNDEFINED,
 	NF_HOOK_OP_NF_TABLES,
 };

 struct nf_hook_ops {
 	/* User fills in from here down. */
 	nf_hookfn		*hook;
 	struct net_device	*dev;
 	void			*priv;
 	u8			pf;
 	enum nf_hook_ops_type	hook_ops_type:8;
 	unsigned int		hooknum;
 	/* Hooks are ordered in ascending priority. */
 	int			priority;
 };

 struct nf_hook_entry {
 	nf_hookfn			*hook;
 	void				*priv;
 };

 struct nf_hook_entries_rcu_head {
 	struct rcu_head head;
 	void	*allocation;
 };

 struct nf_hook_entries {
 	u16				num_hook_entries;
 	/* padding */
 	struct nf_hook_entry		hooks[];

 	/* trailer: pointers to original orig_ops of each hook,
 	 * followed by rcu_head and scratch space used for freeing
 	 * the structure via call_rcu.
 	 *
 	 *   This is not part of struct nf_hook_entry since its only
 	 *   needed in slow path (hook register/unregister):
 	 * const struct nf_hook_ops     *orig_ops[]
 	 *
 	 *   For the same reason, we store this at end -- its
 	 *   only needed when a hook is deleted, not during
 	 *   packet path processing:
 	 * struct nf_hook_entries_rcu_head     head
 	 */
 };

 #ifdef CONFIG_NETFILTER
 static inline struct nf_hook_ops **nf_hook_entries_get_hook_ops(const struct nf_hook_entries *e)
 {
 	unsigned int n = e->num_hook_entries;
 	const void *hook_end;

 	hook_end = &e->hooks[n]; /* this is *past* ->hooks[]! */

 	return (struct nf_hook_ops **)hook_end;
 }

 static inline int
 nf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb,
 		     struct nf_hook_state *state)
 {
 	return entry->hook(entry->priv, skb, state);
 }

 static inline void nf_hook_state_init(struct nf_hook_state *p,
 				      unsigned int hook,
 				      u_int8_t pf,
 				      struct net_device *indev,
 				      struct net_device *outdev,
 				      struct sock *sk,
 				      struct net *net,
 				      int (*okfn)(struct net *, struct sock *, struct sk_buff *))
 {
 	p->hook = hook;
 	p->pf = pf;
 	p->in = indev;
 	p->out = outdev;
 	p->sk = sk;
 	p->net = net;
 	p->okfn = okfn;
 }


 struct nf_sockopt_ops {
 	struct list_head list;

 	u_int8_t pf;

 	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
 	int set_optmin;
 	int set_optmax;
 	int (*set)(struct sock *sk, int optval, sockptr_t arg,
 		   unsigned int len);
 	int get_optmin;
 	int get_optmax;
 	int (*get)(struct sock *sk, int optval, void __user *user, int *len);
 	/* Use the module struct to lock set/get code in place */
 	struct module *owner;
 };

 /* Function to register/unregister hook points. */
 int nf_register_net_hook(struct net *net, const struct nf_hook_ops *ops);
 void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops);
 int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg,
 			  unsigned int n);
 void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg,
 			     unsigned int n);

 /* Functions to register get/setsockopt ranges (non-inclusive).  You
    need to check permissions yourself! */
 int nf_register_sockopt(struct nf_sockopt_ops *reg);
 void nf_unregister_sockopt(struct nf_sockopt_ops *reg);

 #ifdef CONFIG_JUMP_LABEL
 extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
 #endif

 int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
 		 const struct nf_hook_entries *e, unsigned int i);

 void nf_hook_slow_list(struct list_head *head, struct nf_hook_state *state,
 		       const struct nf_hook_entries *e);
 /**
  *	nf_hook - call a netfilter hook
  *
  *	Returns 1 if the hook has allowed the packet to pass.  The function
  *	okfn must be invoked by the caller in this case.  Any other return
  *	value indicates the packet has been consumed by the hook.
  */
 static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
 			  struct sock *sk, struct sk_buff *skb,
 			  struct net_device *indev, struct net_device *outdev,
 			  int (*okfn)(struct net *, struct sock *, struct sk_buff *))
 {
 	struct nf_hook_entries *hook_head = NULL;
 	int ret = 1;

 #ifdef CONFIG_JUMP_LABEL
 	if (__builtin_constant_p(pf) &&
 	    __builtin_constant_p(hook) &&
 	    !static_key_false(&nf_hooks_needed[pf][hook]))
 		return 1;
 #endif

 	rcu_read_lock();
 	switch (pf) {
 	case NFPROTO_IPV4:
 		hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]);
 		break;
 	case NFPROTO_IPV6:
 		hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]);
 		break;
 	case NFPROTO_ARP:
 #ifdef CONFIG_NETFILTER_FAMILY_ARP
 		if (WARN_ON_ONCE(hook >= ARRAY_SIZE(net->nf.hooks_arp)))
 			break;
 		hook_head = rcu_dereference(net->nf.hooks_arp[hook]);
 #endif
 		break;
 	case NFPROTO_BRIDGE:
 #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
 		hook_head = rcu_dereference(net->nf.hooks_bridge[hook]);
 #endif
 		break;
 #if IS_ENABLED(CONFIG_DECNET)
 	case NFPROTO_DECNET:
 		hook_head = rcu_dereference(net->nf.hooks_decnet[hook]);
 		break;
 #endif
 	default:
 		WARN_ON_ONCE(1);
 		break;
 	}

 	if (hook_head) {
 		struct nf_hook_state state;

 		nf_hook_state_init(&state, hook, pf, indev, outdev,
 				   sk, net, okfn);

 		ret = nf_hook_slow(skb, &state, hook_head, 0);
 	}
 	rcu_read_unlock();

 	return ret;
 }

 /* Activate hook; either okfn or kfree_skb called, unless a hook
    returns NF_STOLEN (in which case, it's up to the hook to deal with
    the consequences).

    Returns -ERRNO if packet dropped.  Zero means queued, stolen or
    accepted.
 */

 /* RR:
    > I don't want nf_hook to return anything because people might forget
    > about async and trust the return value to mean "packet was ok".

    AK:
    Just document it clearly, then you can expect some sense from kernel
    coders :)
 */

 static inline int
 NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
 	     struct sk_buff *skb, struct net_device *in, struct net_device *out,
 	     int (*okfn)(struct net *, struct sock *, struct sk_buff *),
 	     bool cond)
 {
 	int ret;

 	if (!cond ||
 	    ((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1))
 		ret = okfn(net, sk, skb);
 	return ret;
 }

 static inline int
 NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb,
 	struct net_device *in, struct net_device *out,
 	int (*okfn)(struct net *, struct sock *, struct sk_buff *))
 {
 	int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn);
 	if (ret == 1)
 		ret = okfn(net, sk, skb);
 	return ret;
 }

 static inline void
 NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
 	     struct list_head *head, struct net_device *in, struct net_device *out,
 	     int (*okfn)(struct net *, struct sock *, struct sk_buff *))
 {
 	struct nf_hook_entries *hook_head = NULL;

 #ifdef CONFIG_JUMP_LABEL
 	if (__builtin_constant_p(pf) &&
 	    __builtin_constant_p(hook) &&
 	    !static_key_false(&nf_hooks_needed[pf][hook]))
 		return;
 #endif

 	rcu_read_lock();
 	switch (pf) {
 	case NFPROTO_IPV4:
 		hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]);
 		break;
 	case NFPROTO_IPV6:
 		hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]);
 		break;
 	default:
 		WARN_ON_ONCE(1);
 		break;
 	}

 	if (hook_head) {
 		struct nf_hook_state state;

 		nf_hook_state_init(&state, hook, pf, in, out, sk, net, okfn);

 		nf_hook_slow_list(head, &state, hook_head);
 	}
 	rcu_read_unlock();
 }

 /* Call setsockopt() */
 int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, sockptr_t opt,
 		  unsigned int len);
 int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
 		  int *len);

 struct flowi;
 struct nf_queue_entry;

 __sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
 		    unsigned int dataoff, u_int8_t protocol,
 		    unsigned short family);

 __sum16 nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
 			    unsigned int dataoff, unsigned int len,
 			    u_int8_t protocol, unsigned short family);
 int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
 	     bool strict, unsigned short family);
 int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry);

 #include <net/flow.h>

 struct nf_conn;
 enum nf_nat_manip_type;
 struct nlattr;
 enum ip_conntrack_dir;

 struct nf_nat_hook {
 	int (*parse_nat_setup)(struct nf_conn *ct, enum nf_nat_manip_type manip,
 			       const struct nlattr *attr);
 	void (*decode_session)(struct sk_buff *skb, struct flowi *fl);
 	unsigned int (*manip_pkt)(struct sk_buff *skb, struct nf_conn *ct,
 				  enum nf_nat_manip_type mtype,
 				  enum ip_conntrack_dir dir);
 };

 extern struct nf_nat_hook __rcu *nf_nat_hook;

 static inline void
 nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
 {
 #if IS_ENABLED(CONFIG_NF_NAT)
 	struct nf_nat_hook *nat_hook;

 	rcu_read_lock();
 	nat_hook = rcu_dereference(nf_nat_hook);
 	if (nat_hook && nat_hook->decode_session)
 		nat_hook->decode_session(skb, fl);
 	rcu_read_unlock();
 #endif
 }

 #else /* !CONFIG_NETFILTER */
 static inline int
 NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
 	     struct sk_buff *skb, struct net_device *in, struct net_device *out,
 	     int (*okfn)(struct net *, struct sock *, struct sk_buff *),
 	     bool cond)
 {
 	return okfn(net, sk, skb);
 }

 static inline int
 NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
 	struct sk_buff *skb, struct net_device *in, struct net_device *out,
 	int (*okfn)(struct net *, struct sock *, struct sk_buff *))
 {
 	return okfn(net, sk, skb);
 }

 static inline void
 NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
 	     struct list_head *head, struct net_device *in, struct net_device *out,
 	     int (*okfn)(struct net *, struct sock *, struct sk_buff *))
 {
 	/* nothing to do */
 }

 static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
 			  struct sock *sk, struct sk_buff *skb,
 			  struct net_device *indev, struct net_device *outdev,
 			  int (*okfn)(struct net *, struct sock *, struct sk_buff *))
 {
 	return 1;
 }
 struct flowi;
 static inline void
 nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
 {
 }
 #endif /*CONFIG_NETFILTER*/

 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 #include <linux/netfilter/nf_conntrack_zones_common.h>

 extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu;
 void nf_ct_attach(struct sk_buff *, const struct sk_buff *);
 struct nf_conntrack_tuple;
 bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple,
 			 const struct sk_buff *skb);
 #else
 static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
 struct nf_conntrack_tuple;
 static inline bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple,
 				       const struct sk_buff *skb)
 {
 	return false;
 }
 #endif

 struct nf_conn;
 enum ip_conntrack_info;

 struct nf_ct_hook {
 	int (*update)(struct net *net, struct sk_buff *skb);
 	void (*destroy)(struct nf_conntrack *);
 	bool (*get_tuple_skb)(struct nf_conntrack_tuple *,
 			      const struct sk_buff *);
 };
 extern struct nf_ct_hook __rcu *nf_ct_hook;

 struct nlattr;

 struct nfnl_ct_hook {
 	size_t (*build_size)(const struct nf_conn *ct);
 	int (*build)(struct sk_buff *skb, struct nf_conn *ct,
 		     enum ip_conntrack_info ctinfo,
 		     u_int16_t ct_attr, u_int16_t ct_info_attr);
 	int (*parse)(const struct nlattr *attr, struct nf_conn *ct);
 	int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct,
 			     u32 portid, u32 report);
 	void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct,
 			   enum ip_conntrack_info ctinfo, s32 off);
 };
 extern struct nfnl_ct_hook __rcu *nfnl_ct_hook;

 /**
  * nf_skb_duplicated - TEE target has sent a packet
  *
  * When a xtables target sends a packet, the OUTPUT and POSTROUTING
  * hooks are traversed again, i.e. nft and xtables are invoked recursively.
  *
  * This is used by xtables TEE target to prevent the duplicated skb from
  * being duplicated again.
  */
 DECLARE_PER_CPU(bool, nf_skb_duplicated);

 #endif /*__LINUX_NETFILTER_H*/
	/* SPDX-License-Identifier: GPL-2.0 */
	#ifndef __LINUX_NETFILTER_H
	#define __LINUX_NETFILTER_H

	#include <linux/init.h>
	#include <linux/skbuff.h>
	#include <linux/net.h>
	#include <linux/if.h>
	#include <linux/in.h>
	#include <linux/in6.h>
	#include <linux/wait.h>
	#include <linux/list.h>
	#include <linux/static_key.h>
	#include <linux/netfilter_defs.h>
	#include <linux/netdevice.h>
	#include <linux/sockptr.h>
	#include <net/net_namespace.h>

	static inline int NF_DROP_GETERR(int verdict)
	{
	return -(verdict >> NF_VERDICT_QBITS);
	}

	static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
	const union nf_inet_addr *a2)
	{
	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	const unsigned long ul1 = (const unsigned long )a1;
	const unsigned long ul2 = (const unsigned long )a2;

	return ((ul1[0] ^ ul2[0]) \| (ul1[1] ^ ul2[1])) == 0UL;
	#else
	return a1->all[0] == a2->all[0] &&
	a1->all[1] == a2->all[1] &&
	a1->all[2] == a2->all[2] &&
	a1->all[3] == a2->all[3];
	#endif
	}

	static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
	union nf_inet_addr *result,
	const union nf_inet_addr *mask)
	{
	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	const unsigned long ua = (const unsigned long )a1;
	unsigned long ur = (unsigned long )result;
	const unsigned long um = (const unsigned long )mask;

	ur[0] = ua[0] & um[0];
	ur[1] = ua[1] & um[1];
	#else
	result->all[0] = a1->all[0] & mask->all[0];
	result->all[1] = a1->all[1] & mask->all[1];
	result->all[2] = a1->all[2] & mask->all[2];
	result->all[3] = a1->all[3] & mask->all[3];
	#endif
	}

	int netfilter_init(void);

	struct sk_buff;

	struct nf_hook_ops;

	struct sock;

	struct nf_hook_state {
	u8 hook;
	u8 pf;
	struct net_device *in;
	struct net_device *out;
	struct sock *sk;
	struct net *net;
	int (okfn)(struct net , struct sock , struct sk_buff );
	};

	typedef unsigned int nf_hookfn(void *priv,
	struct sk_buff *skb,
	const struct nf_hook_state *state);
	enum nf_hook_ops_type {
	NF_HOOK_OP_UNDEFINED,
	NF_HOOK_OP_NF_TABLES,
	};

	struct nf_hook_ops {
	/* User fills in from here down. */
	nf_hookfn *hook;
	struct net_device *dev;
	void *priv;
	u8 pf;
	enum nf_hook_ops_type hook_ops_type:8;
	unsigned int hooknum;
	/* Hooks are ordered in ascending priority. */
	int priority;
	};

	struct nf_hook_entry {
	nf_hookfn *hook;
	void *priv;
	};

	struct nf_hook_entries_rcu_head {
	struct rcu_head head;
	void *allocation;
	};

	struct nf_hook_entries {
	u16 num_hook_entries;
	/* padding */
	struct nf_hook_entry hooks[];

	/* trailer: pointers to original orig_ops of each hook,
	* followed by rcu_head and scratch space used for freeing
	* the structure via call_rcu.
	*
	* This is not part of struct nf_hook_entry since its only
	* needed in slow path (hook register/unregister):
	* const struct nf_hook_ops *orig_ops[]
	*
	* For the same reason, we store this at end -- its
	* only needed when a hook is deleted, not during
	* packet path processing:
	* struct nf_hook_entries_rcu_head head
	*/
	};

	#ifdef CONFIG_NETFILTER
	static inline struct nf_hook_ops *nf_hook_entries_get_hook_ops(const struct nf_hook_entries e)
	{
	unsigned int n = e->num_hook_entries;
	const void *hook_end;

	hook_end = &e->hooks[n]; /* this is past ->hooks[]! */

	return (struct nf_hook_ops **)hook_end;
	}

	static inline int
	nf_hook_entry_hookfn(const struct nf_hook_entry entry, struct sk_buff skb,
	struct nf_hook_state *state)
	{
	return entry->hook(entry->priv, skb, state);
	}

	static inline void nf_hook_state_init(struct nf_hook_state *p,
	unsigned int hook,
	u_int8_t pf,
	struct net_device *indev,
	struct net_device *outdev,
	struct sock *sk,
	struct net *net,
	int (okfn)(struct net , struct sock , struct sk_buff ))
	{
	p->hook = hook;
	p->pf = pf;
	p->in = indev;
	p->out = outdev;
	p->sk = sk;
	p->net = net;
	p->okfn = okfn;
	}



	struct nf_sockopt_ops {
	struct list_head list;

	u_int8_t pf;

	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
	int set_optmin;
	int set_optmax;
	int (set)(struct sock sk, int optval, sockptr_t arg,
	unsigned int len);
	int get_optmin;
	int get_optmax;
	int (get)(struct sock sk, int optval, void __user user, int len);
	/* Use the module struct to lock set/get code in place */
	struct module *owner;
	};

	/* Function to register/unregister hook points. */
	int nf_register_net_hook(struct net net, const struct nf_hook_ops ops);
	void nf_unregister_net_hook(struct net net, const struct nf_hook_ops ops);
	int nf_register_net_hooks(struct net net, const struct nf_hook_ops reg,
	unsigned int n);
	void nf_unregister_net_hooks(struct net net, const struct nf_hook_ops reg,
	unsigned int n);

	/* Functions to register get/setsockopt ranges (non-inclusive). You
	need to check permissions yourself! */
	int nf_register_sockopt(struct nf_sockopt_ops *reg);
	void nf_unregister_sockopt(struct nf_sockopt_ops *reg);

	#ifdef CONFIG_JUMP_LABEL
	extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
	#endif

	int nf_hook_slow(struct sk_buff skb, struct nf_hook_state state,
	const struct nf_hook_entries *e, unsigned int i);

	void nf_hook_slow_list(struct list_head head, struct nf_hook_state state,
	const struct nf_hook_entries *e);
	/**
	* nf_hook - call a netfilter hook
	*
	* Returns 1 if the hook has allowed the packet to pass. The function
	* okfn must be invoked by the caller in this case. Any other return
	* value indicates the packet has been consumed by the hook.
	*/
	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
	struct sock sk, struct sk_buff skb,
	struct net_device indev, struct net_device outdev,
	int (okfn)(struct net , struct sock , struct sk_buff ))
	{
	struct nf_hook_entries *hook_head = NULL;
	int ret = 1;

	#ifdef CONFIG_JUMP_LABEL
	if (__builtin_constant_p(pf) &&
	__builtin_constant_p(hook) &&
	!static_key_false(&nf_hooks_needed[pf][hook]))
	return 1;
	#endif

	rcu_read_lock();
	switch (pf) {
	case NFPROTO_IPV4:
	hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]);
	break;
	case NFPROTO_IPV6:
	hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]);
	break;
	case NFPROTO_ARP:
	#ifdef CONFIG_NETFILTER_FAMILY_ARP
	if (WARN_ON_ONCE(hook >= ARRAY_SIZE(net->nf.hooks_arp)))
	break;
	hook_head = rcu_dereference(net->nf.hooks_arp[hook]);
	#endif
	break;
	case NFPROTO_BRIDGE:
	#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
	hook_head = rcu_dereference(net->nf.hooks_bridge[hook]);
	#endif
	break;
	#if IS_ENABLED(CONFIG_DECNET)
	case NFPROTO_DECNET:
	hook_head = rcu_dereference(net->nf.hooks_decnet[hook]);
	break;
	#endif
	default:
	WARN_ON_ONCE(1);
	break;
	}

	if (hook_head) {
	struct nf_hook_state state;

	nf_hook_state_init(&state, hook, pf, indev, outdev,
	sk, net, okfn);

	ret = nf_hook_slow(skb, &state, hook_head, 0);
	}
	rcu_read_unlock();

	return ret;
	}

	/* Activate hook; either okfn or kfree_skb called, unless a hook
	returns NF_STOLEN (in which case, it's up to the hook to deal with
	the consequences).

	Returns -ERRNO if packet dropped. Zero means queued, stolen or
	accepted.
	*/

	/* RR:
	> I don't want nf_hook to return anything because people might forget
	> about async and trust the return value to mean "packet was ok".

	AK:
	Just document it clearly, then you can expect some sense from kernel
	coders :)
	*/

	static inline int
	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
	struct sk_buff skb, struct net_device in, struct net_device *out,
	int (okfn)(struct net , struct sock , struct sk_buff ),
	bool cond)
	{
	int ret;

	if (!cond \|\|
	((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1))
	ret = okfn(net, sk, skb);
	return ret;
	}

	static inline int
	NF_HOOK(uint8_t pf, unsigned int hook, struct net net, struct sock sk, struct sk_buff *skb,
	struct net_device in, struct net_device out,
	int (okfn)(struct net , struct sock , struct sk_buff ))
	{
	int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn);
	if (ret == 1)
	ret = okfn(net, sk, skb);
	return ret;
	}

	static inline void
	NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
	struct list_head head, struct net_device in, struct net_device *out,
	int (okfn)(struct net , struct sock , struct sk_buff ))
	{
	struct nf_hook_entries *hook_head = NULL;

	#ifdef CONFIG_JUMP_LABEL
	if (__builtin_constant_p(pf) &&
	__builtin_constant_p(hook) &&
	!static_key_false(&nf_hooks_needed[pf][hook]))
	return;
	#endif

	rcu_read_lock();
	switch (pf) {
	case NFPROTO_IPV4:
	hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]);
	break;
	case NFPROTO_IPV6:
	hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]);
	break;
	default:
	WARN_ON_ONCE(1);
	break;
	}

	if (hook_head) {
	struct nf_hook_state state;

	nf_hook_state_init(&state, hook, pf, in, out, sk, net, okfn);

	nf_hook_slow_list(head, &state, hook_head);
	}
	rcu_read_unlock();
	}

	/* Call setsockopt() */
	int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, sockptr_t opt,
	unsigned int len);
	int nf_getsockopt(struct sock sk, u_int8_t pf, int optval, char __user opt,
	int *len);

	struct flowi;
	struct nf_queue_entry;

	__sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
	unsigned int dataoff, u_int8_t protocol,
	unsigned short family);

	__sum16 nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
	unsigned int dataoff, unsigned int len,
	u_int8_t protocol, unsigned short family);
	int nf_route(struct net net, struct dst_entry dst, struct flowi fl,
	bool strict, unsigned short family);
	int nf_reroute(struct sk_buff skb, struct nf_queue_entry entry);

	#include <net/flow.h>

	struct nf_conn;
	enum nf_nat_manip_type;
	struct nlattr;
	enum ip_conntrack_dir;

	struct nf_nat_hook {
	int (parse_nat_setup)(struct nf_conn ct, enum nf_nat_manip_type manip,
	const struct nlattr *attr);
	void (decode_session)(struct sk_buff skb, struct flowi *fl);
	unsigned int (manip_pkt)(struct sk_buff skb, struct nf_conn *ct,
	enum nf_nat_manip_type mtype,
	enum ip_conntrack_dir dir);
	};

	extern struct nf_nat_hook __rcu *nf_nat_hook;

	static inline void
	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	{
	#if IS_ENABLED(CONFIG_NF_NAT)
	struct nf_nat_hook *nat_hook;

	rcu_read_lock();
	nat_hook = rcu_dereference(nf_nat_hook);
	if (nat_hook && nat_hook->decode_session)
	nat_hook->decode_session(skb, fl);
	rcu_read_unlock();
	#endif
	}

	#else /* !CONFIG_NETFILTER */
	static inline int
	NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
	struct sk_buff skb, struct net_device in, struct net_device *out,
	int (okfn)(struct net , struct sock , struct sk_buff ),
	bool cond)
	{
	return okfn(net, sk, skb);
	}

	static inline int
	NF_HOOK(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
	struct sk_buff skb, struct net_device in, struct net_device *out,
	int (okfn)(struct net , struct sock , struct sk_buff ))
	{
	return okfn(net, sk, skb);
	}

	static inline void
	NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net net, struct sock sk,
	struct list_head head, struct net_device in, struct net_device *out,
	int (okfn)(struct net , struct sock , struct sk_buff ))
	{
	/* nothing to do */
	}

	static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
	struct sock sk, struct sk_buff skb,
	struct net_device indev, struct net_device outdev,
	int (okfn)(struct net , struct sock , struct sk_buff ))
	{
	return 1;
	}
	struct flowi;
	static inline void
	nf_nat_decode_session(struct sk_buff skb, struct flowi fl, u_int8_t family)
	{
	}
	#endif /CONFIG_NETFILTER/

	#if IS_ENABLED(CONFIG_NF_CONNTRACK)
	#include <linux/netfilter/nf_conntrack_zones_common.h>

	extern void (ip_ct_attach)(struct sk_buff , const struct sk_buff *) __rcu;
	void nf_ct_attach(struct sk_buff , const struct sk_buff );
	struct nf_conntrack_tuple;
	bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple,
	const struct sk_buff *skb);
	#else
	static inline void nf_ct_attach(struct sk_buff new, struct sk_buff skb) {}
	struct nf_conntrack_tuple;
	static inline bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple,
	const struct sk_buff *skb)
	{
	return false;
	}
	#endif

	struct nf_conn;
	enum ip_conntrack_info;

	struct nf_ct_hook {
	int (update)(struct net net, struct sk_buff *skb);
	void (destroy)(struct nf_conntrack );
	bool (get_tuple_skb)(struct nf_conntrack_tuple ,
	const struct sk_buff *);
	};
	extern struct nf_ct_hook __rcu *nf_ct_hook;

	struct nlattr;

	struct nfnl_ct_hook {
	size_t (build_size)(const struct nf_conn ct);
	int (build)(struct sk_buff skb, struct nf_conn *ct,
	enum ip_conntrack_info ctinfo,
	u_int16_t ct_attr, u_int16_t ct_info_attr);
	int (parse)(const struct nlattr attr, struct nf_conn *ct);
	int (attach_expect)(const struct nlattr attr, struct nf_conn *ct,
	u32 portid, u32 report);
	void (seq_adjust)(struct sk_buff skb, struct nf_conn *ct,
	enum ip_conntrack_info ctinfo, s32 off);
	};
	extern struct nfnl_ct_hook __rcu *nfnl_ct_hook;

	/**
	* nf_skb_duplicated - TEE target has sent a packet
	*
	* When a xtables target sends a packet, the OUTPUT and POSTROUTING
	* hooks are traversed again, i.e. nft and xtables are invoked recursively.
	*
	* This is used by xtables TEE target to prevent the duplicated skb from
	* being duplicated again.
	*/
	DECLARE_PER_CPU(bool, nf_skb_duplicated);

	#endif /__LINUX_NETFILTER_H/